I would recommend starting with a club track day.
The club track days are friendly, well run and because they are sessioned you will be running in a like minded/paced group. You will find that you can go at your own pace and just need to show a little courtesy to the other cars by keeping an eye on your mirrors.
One of the problems with public track days is that you get a wide range of cars running. This means that as well as getting the occasional idiot turning up you will be runing with cars that you will be all over in the corners but can't get past on the straight. This can be a very frustrating experience if the driver in front decide to impress you with his acceleration.
As you can access free tuition on the club track days it makes them excellent value for a beginner.
One piece of advice I have always remembered (I think from Johnny at BAT) was explore your limits from the inside.
Still some places at Oulton Park on 14th July I think so get yourself booked on and enjoy!
Steve
Superlight #63